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@einen gieten geteld- @fitta VJEROME B. GARDNER AND CHARLES H. sWAIN, orNEWV YORK, N. Y.

Letters Patent No. 80,821., dated August 11,1868.

IMPROVEMENT IN STEAM-BOILER FURNAGES.

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VTO ALL WHOM IT MAY CONCERN1- p Be it known that we, JEROME B.GrARDrUgJR'and"CHARLESH. SWAIN, of the city, county, and State of NewYork, have invented new and useful ImprovementsinV Furnaces forASteam-Boilers and We hereby declare that the following is the-manner thesame are to be constructed, reference being had to the accompanyingdrawings, and letters of reference thereo11',/and as particularlydescribed and set forth hereinafter. A

Plate 1, Figure 1, is a perspective view of a horizontal steam-boiler.

AA A A are openings on each side of the boiler, into the fuel orfeed-chamber D D, in plate 2, iig. I, for the admission of'fuel by whichthe furnace is supplied.

B B are covers over. the openings A A A A.

.C GAC are slides, operating in the Afuel or feed-chambers D D, in plate2, fig. I; these slides to be always closed when the covers, B B, areopen.

E is an air-conductor, passing from below the ashpits,.up and throughthe grate-bars F F, in plate 2, g. I, and alittle above theA fuel,perforated on the upper side by small holes, H H, to admit free passageof air through Athem in ne streams, supplying oxygen in sucientquantities to unite with allthe carbon of the fuel.

Plate 2, Figure I, is a sectional end view of a steam-boiler, furnace,and improvements.

vD D arc the fuel or feed-chambers, supplying fuel through the openingsA A A A in plate 1, iig. I, to the grate F F.

E is the air-conductor, perforated on the upper side by holes HIL J J JJ are fire-brick, or other material, to prevent the exposed sides of thefuel-chambers D D frein fusing. The upper side of the air-conductor E iscovered by suitably-formed fire-brick, or othermaterial, to protect itfrom the intense heat.

F F are grate-bars, placed upon a concave frame, to causethe fuel to`fall from the feed-chambers, D D,

towards Vthe "centre .ofthe furnace. g 1

vTo show how'these improvements are constructed, and to enable othersskilled in 'the arts to manufacture and operate them, proceed asfollows: I` v The fuel or feed-chambers, D D, are to be 'constructed onthe sides of the boilers, with bearings at suitable distances for lthesupportof the boilers, ,and running the entire length of them, or less,if desired, of any Width or depth, depending upon the size,'shape, andposition of the boiler, and manner the furnace isset.

The airseonductor, E, may be constructed of iron,covered'withfire-brick, or other suitable material, and

should run the entire length ofthe grate-bars, or may be wholly of fireor other brick, or other suitable material, and be of enough superficialsurface to admit the requisite supply of air to unite with all thecarbon of the fuel.

To operatethe furnace, and to charge the fuel or feed-chambers, proceedas follows:

The slides C C, plate 2, tig. l, must be elosed'to prevent the escape ofgas from the furnaces. The covers B B are then opened, and the fuel putinto the fuel-chambers above the slides C C.

The covers B are then closed, and the slides C C opened. The fuel thenfalls below them to the gratebars F F. The fuel-chambers, to be filledivith fuel up to the slides C C, continue to supply the furnace withfuel till lall is consumed.

The air-conductor E, plate 2, fig. 1, supplies air through the smallholes H H, directly above the fuel on the grates, and may have slides ordempers, to regulate the quantity of air admitted.

Air may alsorbe admitted or introduced through pipes or tubes always,though .perforated directly above the fuel with small holes, to admittheair in fine streams.

1. We claim the'lcornbination of the feed-chambers for the furnaces ofsteamboilers,'with the perforated pipes or conductors, E, which areprotectedby suitable coverings, as described and set forth,

2. The arrangement of the grate-bars F Fv upon a concave frame,causing'the fuel to fall to the centr, in

combination with the feed-chambers and air-pipes and conductors, asdescribed and set forth.

l JEROME B. GARDNER,

CHAS. H. SWAIN.

Witnesses:

W. A. WALTov,4 FnAs Waien'r.

